#11
|
|||
|
|||
Quote:
Fully agree with this thought. I was looking at Columbia mandrel bending company yesterday ..... I get nice bends from them for headers. (using water and SwageLok fittings works for .090" wall 2"o.d. tube for rollbars @NHRA specs. but most of you guys prolly already do that, along with the sand-ramming)
__________________
Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. |
#12
|
|||
|
|||
The only tubing I would recommend using for a chassis build is A513 DOM. 3" is available in .065" wall. I would look for a shop that has a mandrel bender capable of doing that size. With that said I would find the shop BEFORE I buy the material. Wall thickness does come into play when bending tubing, probably more so when using the Pro-Tools or JD2 style follow benders then with a mandrel style, but the wall thickness can be too thin for a follow style bender to do it's job without kinking the tube. You may have to bump up to .083 wall to have it bent.
The other option is to go with a more common size tube. 1 3/4 x .095 wall would build a stout chassis, it is used every day in race car construction and any competent hot rod shop should be able to bend this for you. Mark
__________________
Name: Mark What I am building: BadAst. A Pro Touring style 1988 Astro with a full custom chassis, 509 BBC, TH400 w/ a gear vendors and a 9" w/ 3.75's. |
#13
|
||||
|
||||
Hi Spencer
could you buy manderal bent elbows and use sections to weld together with straight lengths. Steve
__________________
Steve Hamilton Hamilton Classics Auto Restoration & Metalshaping |
#14
|
|||
|
|||
Quote:
Buy the correct material and have it bent. Mark
__________________
Name: Mark What I am building: BadAst. A Pro Touring style 1988 Astro with a full custom chassis, 509 BBC, TH400 w/ a gear vendors and a 9" w/ 3.75's. |
#15
|
|||
|
|||
Quote:
Not recommended for chassis const. Having a mandrel shop do your tubes is the best. They have to see the material and your patterns first. They will ask for longer lengths for leverage to bend at the ends. Pines benders are the best. Kerker Exhaust company (motorcycle exhaust company, years ago) had 3 Pines benders for their production. (I've seen 12in dia. x .032" wall aluminum tubing done - w/12in radius - and having perfect finish on every part with the Pines bender. (Boeing Welded Duct Facility, Renton, WA) yeehaw,
__________________
Kent http://www.tinmantech.com "All it takes is a little practical experience to blow the he!! out of a perfectly good theory." --- Lloyd Rosenquist, charter member AWS, 1919. Last edited by crystallographic; 01-06-2021 at 11:15 AM. |
#16
|
|||
|
|||
An electrical tubing (not conduit, different size that) bends thinwall EMT nice and clean, its about .072. You could rent one of them and give a piece a try, I'd use DOM, .083 if you aren't worried about matching factory specs.
__________________
oj higgins |
#17
|
|||
|
|||
I think think there is a danger in building a chassis with anything other than material of equal or better to the original. You've got to realize that the "history" of a car gets lost over time and owners. you are not talking about cosmetics. You're talking about structure.
__________________
Norm Henderson |
#18
|
|||
|
|||
If the radius is large enough I think you could make a wood buck to support the bend. Sand packing is effective but it's best if you can really pack it in. I've welded a large nut to one end of the tube, capped the other and then further compact with pressure from a threaded rod cranked into the end of the tube. 3 inch tubing might need a more complex assembly to pack but that's the idea I've on up to 1.5 inch tubing. Crank and tap the walls of the tubing and you can compress the sand quite a bit. I like to use 80 grit coal slag blasting media because it's very flowable and easy to work with.
You could also buy the bends. They make a huge range of radius bends here. https://www.morriscoupling.com/asset...-bending-2.pdf I agree looking for a local shop is a good idea but I've got quotes before for one off bends and it wasn't cheap.
__________________
Jeff |
Thread Tools | Search this Thread |
Display Modes | |
|
|